Scientists use a mixture of data and “expert judgment” to decide how likely it is that climate change is man-made and rule out other factors, such as changes in the sun’s output. The IPCC draft halves the likelihood that natural factors are to blame to 5 per cent from 10, the flip side of raising the probability that climate change is man-made to 95 per cent. “It’s based on a discussion among the authors...There must be multiple lines of evidence,” said Eystein Jansen, of the Bjerknes Centre for Climate Research in Norway and one of the authors of the Stockholm draft.

Anyone who doubts the link between climate change and the intense wildfires that ravaged the state this month and last has not been paying attention....Linda S. Adams was former Gov. Arnold Schwarzenegger's lead negotiator for the passage of AB32, California's climate change and clean energy law.

The catalogue of bright ideas that go awry would be funny if it weren’t so tragic. One day poultry farming is the magic bullet, the next its camel safaris or market gardening. If there is a bumper crop, it rots, or provides a rat breeding ground, because nobody thought of how to get it to market. Some genius has an epiphany about bringing in donkeys to fetch water. The donkeys drop dead of exhaustion. Equipment is stolen. Nobody knows how to repair essential generators and pumps. Meanwhile they have to compile copious surveys and statistics to send back to Mr. Sachs’ Earth Institute in Manhattan.